Added security scripts support

2026-09-19 22:07:57 +02:00
parent 1186f4f620
commit 9101a5b48e
17 changed files with 404 additions and 42 deletions
@@ -0,0 +1,112 @@
+export type BuildCspArgs = {
+  /** Google Analytics / GTM — adds googletagmanager + google-analytics. */
+  analytics?: boolean
+  /** Extra sources per directive, merged with the built-ins. */
+  extra?: Partial<Record<CspDirective, string[]>>
+  /** Google Maps embeds — adds maps.google.com / *.gstatic.com. */
+  googleMaps?: boolean
+  /** 'enforce' → Content-Security-Policy; 'report-only' → …-Report-Only header. */
+  mode?: 'enforce' | 'report-only'
+  /** Media/R2 public URL (from R2_PUBLIC_URL) — added to img-src. */
+  r2Url?: string
+  /** Cloudflare Turnstile — adds challenges.cloudflare.com to script/frame/connect. */
+  turnstile?: boolean
+  /** YouTube embeds — adds youtube to frame-src. */
+  youtube?: boolean
+}
+
+type CspDirective =
+  | 'base-uri'
+  | 'connect-src'
+  | 'default-src'
+  | 'font-src'
+  | 'form-action'
+  | 'frame-ancestors'
+  | 'frame-src'
+  | 'img-src'
+  | 'object-src'
+  | 'script-src'
+  | 'style-src'
+
+/**
+ * Builds a Content-Security-Policy string with the hard OWASP/Lighthouse-required
+ * directives baked in, and opt-in sources for common third parties. Solves the
+ * real risk of hand-writing raw CSP per project and forgetting `base-uri 'self'`
+ * or `object-src 'none'`.
+ *
+ * CSP still lives in the project (it lists the project's own domains), but this
+ * helper standardizes the skeleton so every project's CSP has the same hardened
+ * base — you only flip flags for what the project actually loads.
+ *
+ * Returns { key, value } ready for buildSecurityHeaders `additional`:
+ *
+ *   import { buildCsp, buildSecurityHeaders } from '@intecion/ipal-kit'
+ *   const csp = buildCsp({
+ *     mode: 'report-only',            // start here; switch to 'enforce' when clean
+ *     r2Url: process.env.R2_PUBLIC_URL,
+ *     turnstile: true, analytics: true,
+ *   })
+ *   const headers = buildSecurityHeaders({ hsts: prod, additional: [csp] })
+ *
+ * Deploy CSP carefully: start with mode:'report-only', check the console for
+ * violations across the whole site (forms/Turnstile, gallery/R2, embeds), add
+ * missing sources via `extra`, THEN switch to 'enforce'. See docs/security.md.
+ */
+export function buildCsp(args: BuildCspArgs = {}): { key: string; value: string } {
+  const { analytics, extra = {}, googleMaps, mode = 'enforce', r2Url, turnstile, youtube } = args
+
+  const src: Record<CspDirective, string[]> = {
+    'default-src': ["'self'"],
+    // 'unsafe-inline' is hard to avoid with Next/analytics; 'unsafe-eval' is NOT
+    // added by default (weakens CSP) — add via extra only if a library needs it.
+    'connect-src': ["'self'"],
+    'font-src': ["'self'", 'https://fonts.gstatic.com', 'data:'],
+    'form-action': ["'self'"],
+    'frame-src': [],
+    'img-src': ["'self'", 'data:', 'blob:'],
+    'script-src': ["'self'", "'unsafe-inline'"],
+    'style-src': ["'self'", "'unsafe-inline'", 'https://fonts.googleapis.com'],
+    // HARD defaults (OWASP/Lighthouse) — always on, no reason to omit:
+    'base-uri': ["'self'"], // block <base> hijacking
+    'frame-ancestors': ["'none'"], // clickjacking protection (replaces X-Frame-Options)
+    'object-src': ["'none'"], // block <object>/<embed> (Flash-era attack surface)
+  }
+
+  if (r2Url) {src['img-src'].push(r2Url)}
+
+  if (turnstile) {
+    src['script-src'].push('https://challenges.cloudflare.com')
+    src['frame-src'].push('https://challenges.cloudflare.com')
+    src['connect-src'].push('https://challenges.cloudflare.com')
+  }
+
+  if (analytics) {
+    src['script-src'].push('https://www.googletagmanager.com')
+    src['connect-src'].push('https://www.google-analytics.com', 'https://www.googletagmanager.com')
+    src['img-src'].push('https://www.google-analytics.com', 'https://www.googletagmanager.com')
+  }
+
+  if (youtube) {
+    src['frame-src'].push('https://www.youtube.com', 'https://www.youtube-nocookie.com')
+  }
+
+  if (googleMaps) {
+    src['frame-src'].push('https://www.google.com', 'https://maps.google.com')
+    src['script-src'].push('https://maps.googleapis.com')
+    src['img-src'].push('https://maps.gstatic.com', 'https://*.googleapis.com')
+  }
+
+  // Merge caller extras.
+  for (const [dir, values] of Object.entries(extra) as Array<[CspDirective, string[]]>) {
+    if (values && values.length) {src[dir] = [...(src[dir] ?? []), ...values]}
+  }
+
+  const value = (Object.entries(src) as Array<[CspDirective, string[]]>)
+    .filter(([, values]) => values.length > 0)
+    .map(([dir, values]) => `${dir} ${values.join(' ')}`)
+    .join('; ')
+
+  const key =
+    mode === 'report-only' ? 'Content-Security-Policy-Report-Only' : 'Content-Security-Policy'
+  return { key, value }
+}